US20130000120A1 - Method for producing an aluminum piston for an internal combustion engine - Google Patents

Method for producing an aluminum piston for an internal combustion engine Download PDF

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Publication number
US20130000120A1
US20130000120A1 US13/393,873 US201013393873A US2013000120A1 US 20130000120 A1 US20130000120 A1 US 20130000120A1 US 201013393873 A US201013393873 A US 201013393873A US 2013000120 A1 US2013000120 A1 US 2013000120A1
Authority
US
United States
Prior art keywords
piston
skirt
recesses
regions
blank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/393,873
Other languages
English (en)
Inventor
Philipp Rall
Joachim Zander
Rainer Ottmueller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Assigned to MAHLE INTERNATIONAL GMBH reassignment MAHLE INTERNATIONAL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ZANDER, JOACHIM, RALL, PHILIPP, OTTMUELLER, RAINER
Publication of US20130000120A1 publication Critical patent/US20130000120A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/18—Making machine elements pistons or plungers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
    • F02F3/022—Pistons  having means for accommodating or controlling heat expansion the pistons having an oval circumference or non-cylindrical shaped skirts, e.g. oval
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
    • F02F3/027—Pistons  having means for accommodating or controlling heat expansion the skirt wall having cavities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F2003/0007—Monolithic pistons; One piece constructions; Casting of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making

Definitions

  • the invention relates to a method for the production of an aluminum piston for an internal combustion engine, which is configured as a round-skirt piston, having a piston crown, having a ring belt and having a piston skirt that follows the ring belt in the direction facing away from the piston crown, which skirt has two pin bosses that lie opposite one another, whereby the piston skirt has skirt recesses that extend in the direction of the piston axis, in the region of the radially outer face surfaces of the pin bosses.
  • a round-skirt-piston of the type stated initially is known from the European patent application EP 0 167 791 A2, having skirt recesses that extend over the entire axial length of the piston skirt in the region of the pin bosses, so that these regions do not have any contact with the inner cylinder wall after installation of the piston into the engine.
  • These recesses are formed into the piston skirt by means of a lathe, whereby the piston is clamped into the lathe eccentrically in its longitudinal direction, in order to be able to lathe the skirt recesses into the piston skirt. It is disadvantageous, in this connection, that using the lathing methods known from the state of the art, it is only possible to produce skirt recesses whose depth decreases continuously toward the edge of the skirt recesses, so that they have an oval shape in cross-section.
  • the piston is produced using the forging method, using a forging die, the inner surface of which is configured to be complementary to the outer shape of the piston, particularly the shape of the piston skirt, the skirt recesses, and the non-recessed regions of the piston skirt.
  • the inner surface of the forging die can be given any desired shape, so that any desired outer shape of the piston can also be produced with it.
  • FIG. 1 a piston in a side view; whereby the piston skirt is recessed in the region of the face surfaces of the pin bosses,
  • FIG. 2 a section through the piston along the line AA in FIG. 1 ,
  • FIG. 3 A, B two embodiments of the transitions between the recessed and the non-recessed skirt regions.
  • FIG. 1 shows a piston 1 for an internal combustion engine, which is configured as a round skirt piston, consists of aluminum, and is produced using the forging method.
  • the piston 1 has a piston crown 2 , a top land 3 , a ring belt 4 , and a piston skirt 5 having pin bosses 6 , 6 ′ and pin bores 7 , 7 ′.
  • the piston skirt 5 has skirt recesses 9 , 9 ′, in other words the piston skirt 5 is recessed, in these regions, by 0.5 mm to 2 mm in the radial direction, and these regions 9 , 9 ′ thus have a lesser distance from the piston axis 10 , by 0.5 to 2 mm, than the non-recessed regions 11 , 11 ′ of the piston skirt 5 .
  • the transition regions 12 , 12 ′ between the skirt recesses 9 , 9 ′ and the non-recessed regions 11 , 11 ′ of the piston skirt 5 can lie parallel to one another, as in the present exemplary embodiment according to FIG. 1 , or (not shown in FIG. 1 ) they can narrow conically toward one another in the direction of the piston crown 2 or in the direction of the lower end 15 of the piston skirt 5 , facing away from the piston crown.
  • the skirt recesses 9 , 9 ′ can be shaped like the mantle surfaces of a circular cylinder. However, they can also have an oval shape, viewed in cross-section perpendicular to the piston axis 10 , whereby the axis 13 of the pin bore 7 ( FIG. 2 ) is the small axis of ovality.
  • the axial height 14 of the skirt recess 9 , 9 ′ reaches over the entire axial length of the piston skirt 5 , in other words from the ring belt 4 all the way to the lower end 15 of the piston skirt 5 , facing away from the piston crown.
  • the height 14 of the skirt recess 9 , 9 ′ can be freely selected here.
  • FIG. 2 a section through the piston 1 along the line AA in FIG. 1 , it is shown that the circumferential expanse of the skirt recesses 9 , 9 ′ and of the non-recessed regions 11 , 11 ′ of the piston skirt 5 can be defined using the angle ⁇ between a straight line 16 that stands perpendicular on the axis 13 of the pin bore 7 and furthermore perpendicular on the piston axis 10 , and a straight line 17 that connects the piston axis 10 with the transition region 12 ′.
  • the angle ⁇ has a value of 32°. However, it can amount to between 5° and 85°.
  • FIG. 3 shows two embodiments A and B of the transition regions 12 a and 12 b between the skirt recesses 9 and the non-recessed regions 11 of the piston skirt 5 .
  • the transition region 12 a according to FIG. 3A has an edge 18 and 19 that reaches over the entire height 14 of the skirt recess 9 , as compared with the regions 9 and 11 , in each instance.
  • the transition region 12 b according to FIG. 3B connects the two regions 9 and 11 continuously and without edges.
  • the circumferential expanse of the transition regions 12 a and 12 b can be defined by way of the angle ⁇ , ⁇ ′ between straight lines 20 , 21 that connect the edges of the regions 11 and 9 with the piston axis 10 (not shown in FIG. 3 ) and stand perpendicular on the piston axis 10 .
  • This angle ⁇ , ⁇ ′ can amount to between 5° and 20°.
  • skirt recesses 9 , 9 ′ takes place, within the scope of forging technology production of the piston 1 , using a forging die configured to be complementary to the piston skirt 5 . In this way, first a piston blank 1 having the skirt recesses 9 and 9 ′ and the non-recessed regions 11 , 11 ′ of the piston skirt 5 is produced.
  • the non-recessed regions 11 , 11 ′ of the piston skirt 5 and the skirt recesses 9 , 9 ′ are therefore formed.
  • the advantage of the forging method according to the invention, for production of a piston blank consists in that any desired shapes of the skirt recesses 9 , 9 ′ and of the transition regions 12 , 12 ′ can be produced in simple manner. For example, skirt recesses having a shape that is round in cross-section, but also recesses having a shape that is oval in cross-section can be produced in this way.
  • transition regions 12 a and 12 b can be structured between the skirt recesses 9 , 9 ′ and the non-recessed regions 11 , 11 ′ of the piston skirt 5 , in such a manner that they lie parallel to the piston axis 10 or narrow conically toward one another either in the direction of the piston crown 2 or in the direction of the lower end 15 of the piston skirt 5 .
  • the pin bores 7 , 7 ′ are produced by means of a drilling machine, and the grooves of the ring belt 4 are produced using a lathe.
  • the reduction of the surfaces 11 , 11 ′ of the piston skirt 5 that stand in contact with the inner cylinder surface, by means of the skirt recesses 9 , 9 ′, has the advantage of improving the slide properties of the piston.
  • a round-skirt piston having skirt recesses offers longer pin bores 7 , 7 ′ in the direction of the pin axis 13 , as compared with a box piston having face surfaces of the pin bosses that are set back relative to the ring belt, and thus a greater contact surface for the piston pin, so that round-skirt pistons can be put under stress with greater combustion pressures.
  • the method according to the invention has the advantage that the skirt recesses can be shaped in any desired manner. Seen in the direction of the piston axis, the transition regions between the skirt recesses and the non-recessed regions of the piston skirt can have any desired shape, and can be configured in wave shape, for example.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Forging (AREA)
US13/393,873 2009-09-04 2010-09-03 Method for producing an aluminum piston for an internal combustion engine Abandoned US20130000120A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009040120.2 2009-09-04
DE102009040120A DE102009040120A1 (de) 2009-09-04 2009-09-04 Verfahren zur Herstellung eines Aluminiumkolbens für einen Verbrennungsmotor
PCT/DE2010/001045 WO2011026480A1 (de) 2009-09-04 2010-09-03 Verfahren zur herstellung eines aluminiumkolbens für einen verbrennungsmotor

Publications (1)

Publication Number Publication Date
US20130000120A1 true US20130000120A1 (en) 2013-01-03

Family

ID=43536082

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/393,873 Abandoned US20130000120A1 (en) 2009-09-04 2010-09-03 Method for producing an aluminum piston for an internal combustion engine

Country Status (5)

Country Link
US (1) US20130000120A1 (zh)
KR (1) KR20120068891A (zh)
CN (1) CN102575613A (zh)
DE (1) DE102009040120A1 (zh)
WO (1) WO2011026480A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109622874A (zh) * 2019-01-16 2019-04-16 常州市双强机械制造有限公司 油缸杆头的制造工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863707A (en) * 1953-03-16 1958-12-09 Daimler Benz Ag Piston, particularly for internal combustion engines
US4809591A (en) * 1984-12-15 1989-03-07 Ae Plc Pistons with oil retaining depressions
US4847964A (en) * 1988-10-21 1989-07-18 Caterpillar Inc. Method of producing a crown for an articulated piston
US6487773B2 (en) * 2001-03-23 2002-12-03 Mahle Gmbh Method of making one-piece piston
US20080010828A1 (en) * 2006-07-13 2008-01-17 Yamaha Hatsudoki Kabushiki Kaisha Forged piston, internal combustion engine, transportation apparatus and method of making the forged piston

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE928611C (de) * 1953-08-21 1955-06-06 Maschf Augsburg Nuernberg Ag Tauchkolben, insbesondere fuer Verbrennungsmotoren
GB8316428D0 (en) * 1983-06-16 1983-07-20 Ae Plc Machine tools
DE3425203C1 (de) 1984-07-09 1986-01-16 Mahle Gmbh, 7000 Stuttgart Tauchkolben für Verbrennungsmotoren
DE3838217A1 (de) * 1988-04-02 1989-10-19 Mahle Gmbh Tauchkolben fuer verbrennungsmotoren
DE10113629A1 (de) * 2001-03-21 2002-10-02 Thyssen Krupp Automotive Ag Verfahren zur Herstellung von Kolben- bzw. Kolbenbauteilen sowie Schmiedewerkzeug
FR2848129B1 (fr) * 2002-12-05 2006-01-27 Ascometal Sa Procede de fabrication d'un piston pour moteur a explosion, et piston ainsi obtenu
DE102005041000B4 (de) 2005-08-29 2012-07-05 Thyssenkrupp Automotive Ag Verfahren, Fertigungslinie und Kolbenrohling zum Herstellen eines einteilig ausgebildeten Kolbens für Verbrennungsmotoren, sowie Kolben für Verbrennungsmotoren

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863707A (en) * 1953-03-16 1958-12-09 Daimler Benz Ag Piston, particularly for internal combustion engines
US4809591A (en) * 1984-12-15 1989-03-07 Ae Plc Pistons with oil retaining depressions
US4847964A (en) * 1988-10-21 1989-07-18 Caterpillar Inc. Method of producing a crown for an articulated piston
US4847964B1 (en) * 1988-10-21 2000-05-09 Caterpillar Inc Method of producing a crown for an articulated piston
US6487773B2 (en) * 2001-03-23 2002-12-03 Mahle Gmbh Method of making one-piece piston
US20080010828A1 (en) * 2006-07-13 2008-01-17 Yamaha Hatsudoki Kabushiki Kaisha Forged piston, internal combustion engine, transportation apparatus and method of making the forged piston

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Machine Translation of DE3838217 *
Machine Translation of DE928611 *

Also Published As

Publication number Publication date
WO2011026480A1 (de) 2011-03-10
CN102575613A (zh) 2012-07-11
DE102009040120A1 (de) 2011-03-10
KR20120068891A (ko) 2012-06-27

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Date Code Title Description
AS Assignment

Owner name: MAHLE INTERNATIONAL GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:RALL, PHILIPP;ZANDER, JOACHIM;OTTMUELLER, RAINER;SIGNING DATES FROM 20120808 TO 20120814;REEL/FRAME:028960/0292

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION